Prerequisites

The following are required to build the Windows 7 USB Media:

• Windows 7 Machine
• USB Removable Drive

Step by Step: How to prepare the USB

The USB device must be prepared prior to generate the stand alone media.

1. On a Windows 7 PC, Insert the USB device and launch the command line in administrator mode
2. Enter: “Diskpart” from a command line
3. In disk part, Enter: “List Disk” – to view the disk number
4. Select the device with the command “Select Disk 1” and substitute the number 1 with the correct device ID on your system. Make sure you select the correct device as the next step WILL DESTROY ALL DATA on the device selected.
5. Enter: “clean” in the diskpart command line and hit “enter”
6. Enter “create partition primary” in the diskpart command line and hit “enter”
7. Enter “select partition 1” in the diskpart command line and hit “enter”
8. Enter “format quick fs=ntfs” in the diskpart command line and hit “enter”
9. Enter “active” in the diskpart command line and hit “enter”
10. Enter “assign” in the diskpart command line and hit “enter”
11. Enter “exit” in the diskpart command line and hit “enter”

For easy reference please check the below screen shot

Now copy the content  of the ISO .